Single-working-chamber turbopulverizer



C. M. STEIN SINGLE WORKING CHAMBER TURBO PULVERIZER May- 4 1926.

7, 1925 v4 Sheets-Sheet 2 Filed Jan.

lNvENToR May 4 1926. 1,583,429 c. M. STEIN SINGLE WORKING CHAMBER TURBO PULVERIZER y Filed Jan. v. 1925 4 sheets-sheet :s

INVENTOR May 4 1926.

C. M. STEIN sxuGLn WORKING CHAMBER 'run'o PuLvzRrznn \Fi1ed Jan. v. 1925 l4 Sheets-Sheet 4 INVENTOR v case the pulverized product ,suiciently tine is evacuated, the articlesA which are too heavy being return to theA Patented May 44, 1926.

' UNI-TED,STATESQPATENT OFFICE."

climas u. srnrN, or rams, FRANCE, AssIGNon 'ro socm'rn ANONYME, LA counns'rroN 4rm'rroNNnLLn, or Paars, FRANCE'.

l SINGLE-WORKING-CHAMBER TURBOPULVEBIZER@ Application led January 7, 1925. Serial No. 1,081.

To all whom 'it may concern:

Be it known that I, CHARLES M. STEIN, a citizen of the French Republic, residing at Paris, Department of the Seine, 1n`

France, have inventedcertain ncw and useful Improvements in Single-Working- Chamber Turbopulverizers; and I do hereby declare the ollowin to be a' full, clear, and exact description o? the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention concerns pulverizing Vmachines, especially those employed in the production of pulverized coal, whose industrial applications are continuousl developing; its principal object being to o tain a type of crusherin which a constant 'ventilation Vis maintained, both of the fuel being fed in and of the fuel being crushed, soV as to remove al1 particles which have reached the required degree of' ineness, immediately they are formed.- Althou description of the method of working is made with the supposition(a that it is applied to coal, the machine can be used for the pulverization of any other material. In this in suspension in the air, instead of bein blown to the burner, is separated from t e air ,by which it is borne4 by the well known centrifugal rocess and can belcollected in a storing opper.

l o obtain the results enumerated above, af'machine with a single paddle wheel of the usual type was chosen, or for machines of large output, two similar wheels revolving side by side ina single pulverizing chamber. In both cases the method of working is exactly the same, the ob'ect of the juxtaposition of thel two pa dle wheels being solely to increase the production of dust by increasing the number of working parts.

The pulverizer rotary type,.withcrushing paddles or -hammers, and is distinguished by the' fact that due to the arrangement of its parts, the material undergoing' crushing, whatever may be its degree of ineness, is projected in totality and in the form of continuous jet into a separator, whencey the dust which is described below is ofthe crusher lfor the operation to 1rie-finished. By

means of the continuous circulation in the separator of the product the fine particles being moved, do not obstruct t under treatment,- immediately vrecrusher, and the l impact of the paddles on the materlal under' treatment is not diminished. The result is evidently an increase in the eiiiciency of the machine; either anincrease in the possible output or a reduction in the power absorbed.

The machinevwhich vis the object of the present invention enables'the results given aboveto be obtained, because of the arrangement of the parts of the crusher, rotor and stator, without the necessity of any accessory arts such as ventilators or mechanicalhancling appliances of any kind.'

Fig. 1 is an elevatlon and part lonnitudinal cross section of the whole of tie machine in accordance with the invention'.

Fig. 2 is a side view, part in elevation and part in cross section, of the machine .shewn in Fig. 1, the section passn through the vertical transverse plane of t e paddle pulverizer. l

Fig. 3 is an elevation and part longitudinal cross section of another forni in which the machine can be made.

Fig, 4. is a .cross section.-

Fig. 5 is a side view. y Fig. 6 is another variation ofthe machine.

Referring to Figs. land 2,V on' the shaft 1 of the machine, driven by any suitable motor, are keyed the paddles 7 ofthe crusher,

land either at the end of the shaft as shewn inthe drawing, or between the bearings, the ventilator wheel or. blower 2 for extracting the dust, the said ventilator being connected by pipinl 6 and 6 to the extraction chamber 13 w ich `covers the lupper paru of the crusher. l

The material to be crushed is fed into lio per 3, and its introduction into the inachme is controlled l a distributing appliance 16 of a,I well linown type, it passes throughconduit 4 tc the inlet orifices of the crusher. To obtain a better result from the operation of the paddles and articularly where a double pulverizin w eel is employed, the device for feedmg the crusher wit the raw"materi'al should be symmetrical with respect to the 4vertical axis of Fig, 1.

The cover of the crusher has an opening its upper part to which a tapering nozzle 10 is joined, and through which discharge takes place freely at its upper end, against. a relnforced shield 11, prolonged by lateral walls which form two latera conduits 9--9, discharging in the extraction chamber 1 3, on each side of the. crusher. f

The cov'er 12 of the Crusher, the nozzle 10, the shield 11 and the partitions defining the conduits 9 9, form a stator in cast iron, with the necessary joints for erection or 1nspection purposes. Movable linin re provided at the places exposed to wea In lts lower part the crushing'chamber S'has a recess 14 in communication with a space provided in the base of the machine, this space is fitted with a door for cleaning purposes. The stator 8 is connected at its upper part to a sheet iron separator 5 whose purpose will A be described later. This separator is in direct communication with the extraction ventilator 2, by suitable piping 6 and 6.. Openings-of adjustable cross section give accessto the transporting air at either side of the crushing zone, to the lower part of the extraction chamber 13. g

All the product under treatment, already 'more or less finely pulverized, is' carried round by the rapid rotary movement ofV the paddles and escapes .by the lupper nozzle 10, is then stopped by the shield 11- and drops down the channels 9-9, on either side of the paddle wheel in the form of two lateral cur` tains as shewn by the arrows. The air drawn in bythe ventilator extracts all the fine fuel from these curtains the heavier pieces falling back into the crusher to undergo once again theaction of the paddles. vIt is clear from what has been said', that the extraction of the product is done continuously during pulverization, the crusher can therefore only retain coal which will again require to be treated after ventilation.

As the coal is fed infrom the distributor, this operation of extracting the dust is also effected, the particles which are suflciently .fine being-drawn towards the ventilator.

Further, `it can be seen that the air used `for extraction does not cross the zone where pulverizing takes place, but merely touches the zone; the high speed of rotation of the paddles is therefore without infiuence on the power absorbedv by the ventilator.

The cross sections of the separator 5 are designed in such a way that the speed of ascension of the transporting air is very sloW.

Under these conditions the particles which are too heavy cannot cross the zone of small velocity and return by gravity to the pulverizer to undergo further crushing. It is easily conceived that, either by the reduction of the' output of the ventilator. orby an increase of the cross sections of the se arator, both processes influencing. the Spee j of the possible to obtain izing organ is xe on the shaft 1 of the machine, -supported by bearing 1', and driven by any sultable motor, either through the pulley 17 or the coupling 18. The pulverizlng organ consists essentially of a hub 19, keyed onto the shaft ofthe rotor, a disc 20 of' heavy steel platelixed to the hub, the periphery of the disc 20 being cut in such a Way as to take the pulverizing hammers 21. These hammers are rigidly bolted onto angle irons which are themselves solidly riveted onto the disc 20; the working face of the hammers can either be radial or make a certain angle withv the plane passing through the axis of the rotor.

The pulverizing wheel thus formed, re volves in'theinterior of a cast iron stator, including a cover whose shape is usually circular, concentric or not to the path followed by the outer edges of the hammers, and two iiat ends.

An opening in thecover 22'is joined, tangentially for preference, to an outlet nozzle 23, which allows ofthe normal discharge of all the product undergoing crushing.

This nozzle 23 which is of rectangular section at its ljunction with the crushing chamber, may or may not be afterwards transformed into a section of an other shape, square or round 'for examp e. The.

metal for example, introduced by accident.

into-the crusher -together with the materiallto be treated. A door 25 enables this space to be cleaned out from time to time.l

The cover of the crusher as well as the lower recess and the outlet nozzle carry av heavy armouringof metal or any other wearfresistlimit the crushing chamber. laterally are each other the spouts 30-30, through which the distributor feeds the raw material to be crushed. Adjustable air inlet orifices 31-31, enable the air required to carry off the. treated products, to be admitted into the body of the crusher. a

It can be seen that the devices described d product with Referring to Fi s. 3,*4-a'und 5;"the pulver- Av provided with an opening27 into which open the sputsl 28 which lllleturn. the residue or -2 particles requiringfurther' crushing,'from the separator, on the oneha'nd, and on the f above enable the crusher to work symmetrically in all respects and .thus to obtain a greater efliciency. Further, it c an be seen that the 1nach1ne ,thus designed, 1a addition required object to be attained: to

to its rle as a crusher, works as a ventilator with its two suction orifices 31-31, a turbine whose hammers 21 form the blades, a volute 22, an interior profile circular or spiral, and a discharge nozzle 23. It follows that'the machine described will enable the a material by the impact of the pa dles and projection or frictionv'on a resisting cover, the whole of the product under treatment bein continuousl in suspension in the air and y the sole e ect of the construction of the proposed crusher, in the interior of a separator in which the line dusts will be selected, which the air will carry off towards their oint of utilisation, while the remainder will be brought back to the crusher to undergo once again theaction of the paddles together with the raw material fed in by the distributor.

In order to render inspection, taking down and changing the crusher parts more easy,.

arranged to effect .the selection of the particles having the required degree of iineness by means ofthe current of air created by the rotation of the crusher, which is capable of ensuring thetransport of the finished roduct either to the storing hopper, or in tlie case of pulverized coal, to the burners of the furnace.

It is evident that this transport of the finished product cannot be elected to a great distance, the characteristics of the rotor and the stator being essentially fixed with a vie'w to the crushing and discharge to the separator. In the case where the receptacle of the finished product is situated at a distance from the machine, it would be s'- sible to e'ect thetransport b means o an auxiliary blower, which coul be driven by an inde endent motor, or by a pulley re- Y ceiving its motion from the main shaft of the crushing machine, or finally, for greater simplicity, mounted on the' 'shaft of the crushing machine itself, either between the bearings or on a bracket on the opposite side to they pulverizing chamber. The ar- (pulverize rangementl with independent ventilator has j been shewn in dotted lines on the adjoining figures, as an example.' g Fig. 6 shews a cross section of a variation'A of the machine.

The difference between this variation-and the arrangements described above, consists l in the fact that, owing to a modification in the interior arrangement of the separator,

the passa of the residues through the separator is e ected by a single ajutage, and that their return to the crusher, instead of being made at the same time as that of the raw material in the central zone of the two lateral faces ofthe crushing chamber, is made at' the periphery of this chamber, through an inlet orifice 32, which is tangential for preference, in a direction opposite to that f the discharge nozzle. I

The machine can thus still Work symmetrically and all that has been said a'bove is exactlg 'applicable to the new arrangement.

In g. 6 the paddles have been shewn, as

an example with their working faces in a 3 direction which is not radial.y It will be evident to any expert that modifications of details can be made to the machine as de-v scribed, without going beyond the limits of no the invention.

What I claim is:

1. A pulverizer comprising a casing hav-y ing a lateral slpply inlet. a rotary pulverizer mounted a jacent said inlet and inducing an air blast through the casing, a` discharge nozzle above the pulverizer, a deflecting hood surrounding the nozzle and forming return passages for the material acted upon by the pulverizer, andy a dschar e outlet for tine material at the top of t casing; p c

2. pulverizer comprising a casing hav-. ing a lateral supply inlet, a' rotary pulverizer mounted adjacent said inlet and inducing an air blast throu h the casing, a discharge nozzle above t e pulverizer, a vde fleeting hood surrounding the vnozzle and forming return pass es Ifor the material acted upon by the pu verizer, a separator connected to' the top of the casing, fan blower connected to the discharge lend of thevseparator.

3. A pulverizer comprising a casing, a rotary pulverizer inducing an air blast through the casing, a discharge nozzle above U5 the nulzerizer, a separator above the nozzle, and passages connecting the separator with the casing to return the heavy materials to the pulverizer.

In testimony whereof I aix my signature.

CHARLES M. STEIN.

and a 

